michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef MOZILLA_BASEPOINT4D_H_
michael@0: #define MOZILLA_BASEPOINT4D_H_
michael@0: 
michael@0: #include "mozilla/Assertions.h"
michael@0: 
michael@0: namespace mozilla {
michael@0: namespace gfx {
michael@0: 
michael@0: /**
michael@0:  * Do not use this class directly. Subclass it, pass that subclass as the
michael@0:  * Sub parameter, and only use that subclass. This allows methods to safely
michael@0:  * cast 'this' to 'Sub*'.
michael@0:  */
michael@0: template <class T, class Sub>
michael@0: struct BasePoint4D {
michael@0:   T x, y, z, w;
michael@0: 
michael@0:   // Constructors
michael@0:   BasePoint4D() : x(0), y(0), z(0), w(0) {}
michael@0:   BasePoint4D(T aX, T aY, T aZ, T aW) : x(aX), y(aY), z(aZ), w(aW) {}
michael@0: 
michael@0:   void MoveTo(T aX, T aY, T aZ, T aW) { x = aX; y = aY; z = aZ; w = aW; }
michael@0:   void MoveBy(T aDx, T aDy, T aDz, T aDw) { x += aDx; y += aDy; z += aDz; w += aDw; }
michael@0: 
michael@0:   // Note that '=' isn't defined so we'll get the
michael@0:   // compiler generated default assignment operator
michael@0: 
michael@0:   bool operator==(const Sub& aPoint) const {
michael@0:     return x == aPoint.x && y == aPoint.y && 
michael@0:            z == aPoint.z && w == aPoint.w;
michael@0:   }
michael@0:   bool operator!=(const Sub& aPoint) const {
michael@0:     return x != aPoint.x || y != aPoint.y || 
michael@0:            z != aPoint.z || w != aPoint.w;
michael@0:   }
michael@0: 
michael@0:   Sub operator+(const Sub& aPoint) const {
michael@0:     return Sub(x + aPoint.x, y + aPoint.y, z + aPoint.z, w + aPoint.w);
michael@0:   }
michael@0:   Sub operator-(const Sub& aPoint) const {
michael@0:     return Sub(x - aPoint.x, y - aPoint.y, z - aPoint.z, w - aPoint.w);
michael@0:   }
michael@0:   Sub& operator+=(const Sub& aPoint) {
michael@0:     x += aPoint.x;
michael@0:     y += aPoint.y;
michael@0:     z += aPoint.z;
michael@0:     w += aPoint.w;
michael@0:     return *static_cast<Sub*>(this);
michael@0:   }
michael@0:   Sub& operator-=(const Sub& aPoint) {
michael@0:     x -= aPoint.x;
michael@0:     y -= aPoint.y;
michael@0:     z -= aPoint.z;
michael@0:     w -= aPoint.w;
michael@0:     return *static_cast<Sub*>(this);
michael@0:   }
michael@0: 
michael@0:   Sub operator*(T aScale) const {
michael@0:     return Sub(x * aScale, y * aScale, z * aScale, w * aScale);
michael@0:   }
michael@0:   Sub operator/(T aScale) const {
michael@0:     return Sub(x / aScale, y / aScale, z / aScale, w / aScale);
michael@0:   }
michael@0: 
michael@0:   Sub& operator*=(T aScale) {
michael@0:     x *= aScale;
michael@0:     y *= aScale;
michael@0:     z *= aScale;
michael@0:     w *= aScale;
michael@0:     return *static_cast<Sub*>(this);
michael@0:   }
michael@0: 
michael@0:   Sub& operator/=(T aScale) {
michael@0:     x /= aScale;
michael@0:     y /= aScale;
michael@0:     z /= aScale;
michael@0:     w /= aScale;
michael@0:     return *static_cast<Sub*>(this);
michael@0:   }
michael@0: 
michael@0:   Sub operator-() const {
michael@0:     return Sub(-x, -y, -z, -w);
michael@0:   }
michael@0: 
michael@0:   T& operator[](int aIndex) {
michael@0:     MOZ_ASSERT(aIndex >= 0 && aIndex <= 3, "Invalid array index");
michael@0:     return *((&x)+aIndex);
michael@0:   }
michael@0: 
michael@0:   const T& operator[](int aIndex) const {
michael@0:     MOZ_ASSERT(aIndex >= 0 && aIndex <= 3, "Invalid array index");
michael@0:     return *((&x)+aIndex);
michael@0:   }
michael@0: 
michael@0:   T DotProduct(const Sub& aPoint) const {
michael@0:     return x * aPoint.x + y * aPoint.y + z * aPoint.z + w * aPoint.w;
michael@0:   }
michael@0: 
michael@0:   // Ignores the 4th component!
michael@0:   Sub CrossProduct(const Sub& aPoint) const {
michael@0:       return Sub(y * aPoint.z - aPoint.y * z,
michael@0:           z * aPoint.x - aPoint.z * x,
michael@0:           x * aPoint.y - aPoint.x * y, 
michael@0:           0);
michael@0:   }
michael@0: 
michael@0:   T Length() const {
michael@0:     return sqrt(x*x + y*y + z*z + w*w);
michael@0:   }
michael@0: 
michael@0:   void Normalize() {
michael@0:     *this /= Length();
michael@0:   }
michael@0: };
michael@0: 
michael@0: }
michael@0: }
michael@0: 
michael@0: #endif /* MOZILLA_BASEPOINT4D_H_ */